Process for dyeing and printing textile fibers



Patented Apr. 18,

, UNITED STATES.

WALTER MIEG, or OPLADEN, Am) RUDOLF? HEIl DE NRIilIQ H, or Lnviinxusnn- ON-THE-RHINE, GERMANY, ASSIGNORSTOGENERALEAN1LIENEFWORKSQINQ, or.

. mew YORK, N. Y., A CORPORATION or DELAWARE PROCESS FOR DYEING AND PRINTING TEXTILE No Drawing. Application filed J'une.18, 1930, Serial No. 452,139, and in Germany J'iine 19, 1929. V

The present invention relates to a process for dyeing and printing textile fibers byimpregnating (that is dyeing or printing) the fibers with an ester of a leuco compound of a vat dyestufi of the anthraquinone series, saponifying thisester on the fiber by means of an alkaline agent and oxidizing the leuco compound to the vat dyestufi', from which the leuco ester is derived;

In accordance with the present invention textile fibers are impregnated in the: known manner with an ester of a leuco compound" of a vat dyestufi of the anthraquinone series having in its free form the probable formula:

80111 R w :i

wherein R stands for the radical of a leuco V derivative of a vat dyestufl of the anthraquinone series, the CO-group being attached to an oxygen atom, which on 1ts part 1S linked to a carbon atom standing in mesoposition of an anthraquinone nucleus, and

tive of an anthraquinoid vat dyestufl with I a benzoic acid sulfo halide in the presence of a tertiary heterocyclic base as described in U. S. Patent No. 1,878,964, issued on September 20,- 1932, it is possible to add a little alkali to the thickening required for the printing process, in which'case the decomposition and oxidation to the dyestufi isalready partially accomplished by moist steaming. The developing of the dyestuff is completed by passingthe dyeings through fstufi' paste consisting of: i A l a 5 parts by weight of thedeuco-N-dihydrois effected by exposing the printing to the action of an oxidizing agent as, for instance,

air. r

1.2-2.1'-anthraquinone-azine ester, 'obtainable by reacting "upon: leuco-Nedihydrd 1.2-2.1-anthraquinone azine with a mixture of benzoic-acid-meta-sulfochloride and pyridine at a temperature 'of about..:70 80. C. (see U. S. Patent No. 1,878,964 of September 20, 1932).

5 parts by weight of thiodiglycol 20 parts by weight of gum I 7 0 "parts by weight of a thickening The thickening is prepared according to V.

the following directions 100 grams .of potassium sulfite solution (45 B.) are mixed with 400 grams of caustic soda solution 36 Be. and Y 500 grams of commercial gum 1:1

of N-dihydro-1.2-2.1 anthraquinoneazine is thus obtained.

We claim V a I 1. Process which comprises impregnating textile fibers with a compound having in its free form the probable'formula: 1

sons;

wherein Rrepresents the radical of a leuco derivative of an anthraquinoid vat dyestufi,

a dilute alkali for a short time and oxidation the CO-group being attached to an oxygen atom, which on its part is linked to a carbon atom standing in meso-position of an anthraquinone nucleus, n stands for one of the numbers 1201-12, and develogingythe dyestuii on the' fibreldy treating the-latter--with an alkali and an oxidizing agent.

2-.12rocess. which comprises. impregnating textilefibres Witha rcompound'ihaving in its fiee form the probable formula:-

and developing the dyestufi on-thefibret by treatingthe latter Wit/1173,11 alkali and an oxidizing agent.

In testimony whereof, we aflix oun signatures.

WALTER MIEG;

RUDOLF MARIA HEIDENREIOH; 

